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It modulates, according to the load however not efficeintly. I'm done with it, I almost got booted because of this thread so I'm going to become more agreeable.I apolegize to anyone I may have offended.

how did you guys know i was coming?you guys have been waiting on me,ain't ya??.....got a cap tube system today,and i'm learning......would this explain why when i pressured lines i had equal pressure on both sides????i pulled vacum it held and pressured it up and thought i had leak.....................